STEEL SHEET FOR DEEP DRAWING HAVING EXCELLENT SECONDARY WORK EMBRITTLEMENT RESISTANCE, FATIGUE PROPERTIES AND PLATING PROPERTIES, AND METHOD FOR MANUFACTURING THE SAME

摘要

A steel sheet for deep drawing used for automobiles, and a method for manufacturing the same are disclosed. The steel sheet comprises, by weight%, C: 0.010% or less, Si: 0.02% or less, Mn: 0.06 ~ 1.5%, P: 0.15% or less, S: 0.020% or less, Sol. Al: 0.10 ~ 0.40%, N: 0.010% or less, Ti: 0.003 ~ 0.010%, Nb: 0.003 ~ 0.040%, B: 0.0002 ~ 0.0020%, and the balance of Fe and other unavoidable impurities, wherein the composition of Ti, Al, B, and N satisfies the relationship: 1.0 (Ti[%]+Al[%]/16+6B[%])/3.43N[%] 4.1, and wherein the composition of Nb, Al, and C satisfies the relationship: 0.7 (Nb[%]+Al[%]/20)/7.75C[%] 3.5. The steel sheet exhibits excellent secondary work embrittlement, fatigue properties of welded joints, and an appealing plated surface as well as excellent formability.